Unfortunately, unless there was a new kit unveiled at SEMA this year, I don't think such kit exists. Your best bet is to start with a Twisted Metal Workz rear 4 link kit, but you will still need to have bag mounts made/installed. As far as the front, maybe there is a K1 front bag kit that can work with some modifications, otherwise you will need to have custom bag/shock mounts installed.
The Twisted Metal Workz rear 4 link kit is $1650, might be cheaper if you can get it without the Viking coilovers. All in with 4 link kit, bags, shocks, C notch, air management and fab work, I bet you're into it for close to $5k.
A cheaper route will be to use the Twisted Metal Workz 4-link w/ Viking coilovers for the rear and their Viking coilover kit for the front. It will adjustable enough to get the ride height leveled but that's about it. Even this route is still $2500.
I have the Belltech 4/6 (rear flip kit is a modified DJM from a 2018) with Twisted Metal Workz weld in Notch and IHC helper bags on my 21 RST. Ride is ok, but nothing like a bagged setup. I have 10k miles on the truck now and I think the Belltech struts/shocks are already going bad, the ride is getting noticeably bouncier. If I were you, I'd definitely stay away from Belltech and go the coilover route or IHC, if you can't do the bagged setup right now.